#!/usr/bin/python
#Filename:using_dictionary.py

#'ab' is short for 'a'ddress 'b'ook

ab = { 'Swaroop':'swaroopch@byteofpython.info',
        'Larry' : 'larry@wall.org',
        'Matsumoto' : 'matz@ruby-lang.org',
        'Spammer' : 'spammer@hotmail.com',
        }

print 'Swaroop\'s address is %s ' % ab['Swaroop']

#Adding a key/value pair
ab['Guido'] = 'guido@python.org'

#Delete a key/value pair
del ab['Spammer']

print '\nThere are %d contacts in the address-book\n' % len(ab)

for name,address in ab.items() :
    print 'Contact %s at %s' % (name,address)

if 'Guido' in ab : #OR ab.has_key('Guido')
    print "\nGuido's address is %s " %ab['Guido']


